This interactive heatmap displays the distribution of pet types across Seattle zip codes, with each cell colored by the count of a specific primary breed. The visualization uses a red sequential color scale to highlight density variations, and tooltips reveal detailed information about zip code, species, and breed on hover. Built with Vega-Lite and rendered via the Vega-Lite API, the chart loads data from a CSV file containing Seattle pet license records and automatically fits its size to the browser window.